:root {
  --bg: #0b0f14;
  --bg-2: #121821;
  --bg-3: #182130;
  --fg: #d8e2ef;
  --fg-dim: #8b9ab0;
  --accent: #4ec9b0;
  --accent-2: #f0a24a;
  --line: #24303f;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font:
    14px/1.45 ui-sans-serif,
    system-ui,
    'Segoe UI',
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
}

.app-header {
  padding: 14px 18px 8px;
  border-bottom: 1px solid var(--line);
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 18px;
  letter-spacing: 0.02em;
}

.tagline {
  margin: 0;
  color: var(--fg-dim);
  font-size: 12px;
}

.app-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 16px;
  padding: 16px;
  align-items: start;
}

@media (max-width: 960px) {
  .app-main {
    grid-template-columns: minmax(0, 1fr);
  }
}

.stage {
  min-width: 0;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

button {
  background: var(--bg-3);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 12px;
  font: inherit;
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

button.primary {
  background: var(--accent);
  color: #05231d;
  border-color: var(--accent);
  font-weight: 600;
}

.canvas-wrap {
  background: #05080c;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px;
  overflow: auto;
}

canvas {
  display: block;
  max-width: 100%;
  height: auto;
  image-rendering: pixelated;
  touch-action: none;
  cursor: crosshair;
}

.status {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 10px;
  font-variant-numeric: tabular-nums;
}

.stat {
  display: flex;
  gap: 6px;
  align-items: baseline;
}

.stat-label {
  color: var(--fg-dim);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stat-value {
  color: var(--fg);
  font-weight: 600;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 8px;
  color: var(--fg-dim);
  font-size: 12px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  border: 1px solid var(--line);
  display: inline-block;
}

.swatch.ramp {
  background: linear-gradient(90deg, rgb(70, 130, 255), rgb(16, 18, 24), rgb(255, 120, 40));
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.group {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px 12px;
}

.group h2 {
  margin: 0 0 8px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.ctl {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  margin-bottom: 10px;
}

.ctl-label {
  font-size: 12px;
  color: var(--fg);
}

.ctl-field {
  display: flex;
  gap: 8px;
  align-items: center;
}

.ctl-range {
  flex: 1 1 auto;
  min-width: 0;
}

.ctl-num {
  width: 78px;
}

.ctl-hint {
  font-size: 11px;
  color: var(--fg-dim);
}

input[type='number'],
select,
textarea {
  background: var(--bg-3);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 4px 6px;
  font: inherit;
}

select {
  width: 100%;
}

textarea {
  width: 100%;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
}

input[type='range'] {
  accent-color: var(--accent);
}

input[type='checkbox'] {
  accent-color: var(--accent);
}

.row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.hint {
  color: var(--fg-dim);
  font-size: 11px;
  margin: 4px 0 6px;
  min-height: 1.4em;
}

.errors {
  color: var(--accent-2);
  font-size: 11px;
  margin: 4px 0 0;
}
.group h2.collapsible {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}
.group h2.collapsible::after {
  content: '▾';
  font-size: 10px;
  color: var(--fg-dim);
  transition: transform 0.15s ease;
}
.group.collapsed h2.collapsible::after {
  transform: rotate(-90deg);
}
.group.collapsed .group-body {
  display: none;
}
.stage:fullscreen {
  background: var(--bg);
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100vh;
}
.stage:-webkit-full-screen {
  background: var(--bg);
}
.stage:fullscreen .canvas-wrap {
  max-height: 90vh;
  display: flex;
  justify-content: center;
}
.stage:fullscreen canvas {
  max-height: 90vh;
  width: auto;
}